<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表格细线边框</title>
    <style>
        table{
            border: deeppink solid 2px;
            width: 300px;
            height: 300px;
            border-collapse:collapse;

        }
        td{
            border: deeppink solid 2px;
             border-collapse:collapse;
        }
    </style>
</head>
<body>
    <table cellspacing"0">
        <thead>
            <tr>
                <td>1</td>
                <td>1</td>
            </tr>
            <tr>
                <td>1</td>
                <td>1</td>
            </tr>
            <tr>
                <td>1</td>
                <td>1</td>
            </tr>
            <tr>
                <td>1</td>
                <td>1</td>
            </tr>
        </thead>
    </table>

</body>
</html>